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An easy to use, yet complex firewall

Fiaif is an Intelligent Firewall.

The Goal of FIAIF is to provide a highly customizable script for
setting up an iptables based firewall.

Unlike many other scripts, FIAIF can be truly customized allowing
multiple interfaces (or rather zones). There is no limit on the number
of zones. All configuration is done through configuration files.
No need to understand the script behind it all.

The script makes heavy use of state-full firewalling,
and all RELATED and ESTABLISHED packets are accepted on all chains.
If you which to block something out, don't accept it in the first place.

The script is written in BASH. Though this is not the optimal
program to use, it means that you do not need to install extra
interpreters on your firewall.
This allows you to have a minimalistic installation on your firewall.